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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739488384c3e0f0336955aa6f620cc87dc90d5a5350550fc73b14859ca08b714' 
  AND token = 'XFp9Xa1+5pxS6mtDd7bYbkLPmmCIbdcazvBM5VD8b6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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