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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0669e283b5b370262f3e77b0b434c9a85e178259139b62fcc6422384d6cba978' 
  AND token = '/ywiQ/lbaBW+yGwG39V5kmTOEJEu9dM7CZCW9ARc/U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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