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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2f68ff47e50b2baa4953a7d47c1c4a995bf82a16b7e80e266938a51b0929af' 
  AND token = 'adIVMRxSHAJBL5dU3GgEyQ2kKrf7l3tqCFkzY7ISBnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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