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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fc1613ba53d4655f6d6911a7631de671589ca4145a4b6f49b424b4a7e7eb80' 
  AND token = 'O4EKroKJI4WpxaTlc8oHIqT94dNK6bdYigrX5RcLFKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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