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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac86849c974eabd4740947c8ef04b8618702343d05d13c4e708f8b99634b1a6' 
  AND token = 'CLJ7fkuE4g3+Y+AQEPisEGg36F5RCDmUB/gu/+vgR+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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