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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174f47fb919b5f1abaa7a030765a62960723eef43dffff45a02ea82a1a84efca' 
  AND token = 'Ho9ORna6UJMFdCqP8/wEYmg450S8UsLyhrf/ZdZyp84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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