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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844a2c9485315bb37e96be577a703089e26406b1acf98bc622976075e1d5932e' 
  AND token = 'WAiVu5fEj4efkV8dl2301m6NfSUoRI99XQIEZMfEehk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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