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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdf2ef70a8738cfac29e66ef54a5da5fd918cf7c7d7ffdd2ffb547c1bfe8f4f' 
  AND token = 'tIFKeb3rsf0h2FKKjR25wVHzM7LaKO7p90opY4HHBns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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