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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238adae5679cd205ca50b9ed5950e514c15ce908083ab8c0ff1a25ed4a249e6e' 
  AND token = 'bgM2Gx5xid5qTnYY1gK4iURfPSOdm2iJkpvhBvnmwss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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