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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5683d1a87fe9efbaff964dfc33bfd90a444fa270f0f8ebb3b9528081accc76' 
  AND token = 'khznhjIi+ycNwUi8FGOfJJtJjhPt2z/+yfpiKB+u8H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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