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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde63f9512c8a4b672e8ae699eba41b2d75590e34b048d5cfc08ff39f7fbd8ef' 
  AND token = 'waJL/5EbuTle10Fo80iBgh+YXE3d2uKuTf93EX+2zt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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