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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eee354bda00719640512d15d2fa51da0d46dd42534b9f4e33e0a26823122d72' 
  AND token = 'embWu4wK/dqyLAfA3KDN5fdIbBAZJBXmuxa0x7/bAic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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