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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a862096597d6e1b8cfec4038580ec0bcad1f50fbcf57a45d103927ed74cf39' 
  AND token = '22WWtzVTOEP73xsuUFdhyGtMzJfkIdznt6WgGT8JzLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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