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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cda8ba7e1b40ab84468d5607179195707e2da17e3df951b57a38dcf2d7bab8d' 
  AND token = '9MvP608HU2fs8f/pR7x175sb4dhLEndvbXITO5mTcuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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