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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5435f9cbb3a99eda1a6931d8d3ef35c9acd0fefb88a029c17b5619775dd818' 
  AND token = 'VqsDZsMrFyj9yRlkj3oHjdxKmbS8yFjo4p3bhtUu9JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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