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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3844335c7e30df4489b226e525d3fbd621575238c687ffc1fa4e64508c80c6d0' 
  AND token = 'kQQf3xqFEFNMZGV+1qlnBJq3HsPs9XXfTYRP9ebqy94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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