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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8f76b4658b5ea23724dbb558b64d6993ec7d28bb1afb5e6b74aa17d5f7dfd6' 
  AND token = 'USTli644inaUOQIVklLfCGpsyevI5BEtQEtBBFrNt7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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