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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a01425aadff1f2e072551b05cba71af462edacf82abbafd173e6ebe32c2fe5f' 
  AND token = 'lfb6RNLQ2nEir3k6VvsztkFt6M++4uaIgQbNwGRo3Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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