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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439cef0c027b2b2b787d2c939b76b12271d4e3fcc94bdc2caf0356bf97f70396' 
  AND token = 'Wqp1SOtGMk13PfXFg3kjvUZHbV+h4u5c2g73XJAaMTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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