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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950aedf0abf139ec128c062f53681d9ab7f17dc24047aff9008d35ec911d9c26' 
  AND token = 'w0i89aOGK+nGu/Z0Nf3U8/7mVPlM79iHP2GQUJ/0P78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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