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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b384a6f5e13b7c144462ba5ab2057ad7edeb94759edcc88a710dcffa8adddb' 
  AND token = 'JMpiSafoS3tikZq05wJ94lrHrhHAde6AuykEe0SX5VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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