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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f62d101919a3d1dde9aa5cb0a1761cfbeec7c661aa188c6f7d064dfbd97587' 
  AND token = 'lgop9AUNY+iu64QZyYKAb7uqRT+52todhszOYoMmES8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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