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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5064ae414f0a1fd9e242426418ac8cd89669a1cc7602be88f8c9393651c53ac6' 
  AND token = 'KJk+xT+lF+tvrvHlM7a0ujfMIRDhiYT7uynkkEzevGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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