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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f792c6cb25cd6589ab248157ad6397352e67b7c810ab4836a28a29eae2c69de5' 
  AND token = 'DItz+I+07PFlC9218xf2lb+mNRJpTibtABCj/3aDsmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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