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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12edee92ad45cbf2efd02dd14494f84607febd8d22a5abff69bcb51d55a31931' 
  AND token = 'QYhTXeEeGMsSsLvpldcNQsaC4yz66UR9DR9Q0wWGh/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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