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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a2765a06206f2309d7a9b14c0b0b80df0d8d4b43cd033ab717d9f49a2c13fc' 
  AND token = '8HjDXaKZ7fUOBZbemTUyimOXeGpw/74NvnD1Eg49Ufo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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