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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8551a68100dc55815361e2430d8e9b9bcc19ee16da0ddd09c59866e427bdc756' 
  AND token = 'Bkf65NdL+nFQKrAZ5mc7viM/iJBhhWNTbJek85cdb4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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