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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a9922dafe2a1da405a1fdc9f292ba526a4df8e10a8b731f534d2963ab16f68' 
  AND token = 'rh9XdpeEPZEI62XuofHwFLlaMw6M7+TA9zVbwr5ZFe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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