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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0e647fe8e2c4b2b72f06513eca18539dcdf4d8b26d18a3e701e6bc834f3323' 
  AND token = 'zQflku4VkN1ZQZ9ocr9PARIS7P/vO5eexR8weYuSErM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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