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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becc018938642f71385f30c763f4eb6559c62abc2b47af0d4a80c5e60d1ad8d9' 
  AND token = 'mYdKXr1BMXEnQj3ZmYGqWdOYrDIVt03mUeDClCwo32Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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