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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feee3bf009d5ac0006af69737a84eba0bd66acb6a325bc694723dcc07efa0817' 
  AND token = 'ZF+pQ/abqQ/NjDxjAiyHGhBsfrLToeSGc9rINu/sG+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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