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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a0ffe1211d270d26986abc080ca1158347a5b30a8a8362802e65e56adfc3d9' 
  AND token = 'sh5zMhQpnusE/tshjmD1jHU3K8ObzFqmP0y/U9WUeIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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