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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96526136ee763ac2020d6f7f7749c8db0c7cf7d3f57b9be37dc3f6de6cbd338d' 
  AND token = 'A+dUKt48rMTZTN9i3CsV99fwIR9pN3tz9a8X9tczCuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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