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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd53f1347ee16b00b3f98da69873c50d5e795e3a2db1e8ecfac683fe7a938dde' 
  AND token = 'XGFba3xajhxCBucXIgkl7fswVvcobk9AMYe/pVxn/rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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