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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f266eb89b19a4953a25fc49720ef5b4788c645c44a828c6813f61564ea705e' 
  AND token = '4CyVnHe/9Y22L5meihNbJhpr7asx5PH3ka6jWH10Lu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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