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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e1e4bd8a5b67e1bea7c678e520ec41e07330ff0b7e5f6c28c1a2f80882cb4b' 
  AND token = 'q0UFXNxbkxm3cRpxKX51/BFlXHD2SUhymol32OymCfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}