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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c01a71fb166efbe2dc840a0eaea7cded763b8efbf7c84a6153fea6e17b35ff5' 
  AND token = '/0+juboOLwRFQom0FXJRIukaEEbEinqcqOnu1exUMk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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