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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0d14e7bf8f093bae8a68fe9a93e524d69d45831e17066df359d5f072604c9d' 
  AND token = 't3H+7Bde6Ff/K94yg9fNLgriqaYtQyooZxdkdRiDioM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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