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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770baba1e8f75c76d67ed484890d929fef9a79f291db4ac7bd6475cd0e3ad0ce' 
  AND token = 'bnmwNnXD2zAboxhCeBYu0Zo7Oncgv2NXT3A66mWIvDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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