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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb30358e50d39112a5bf519963c2b5aa143240f7008518eb37a574c9c4786cb' 
  AND token = 'ndj1JW9g7NyHBs7subb0KK1g5/TLOdGrpal1i9x6O5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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