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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338fd0654a2a8d47ddde91fb4dbb6b0fb9c98d781885921508d76d27f5292069' 
  AND token = 'gK3O5yKoes7Hn90Tflxk5HH6S/y2B41M0eQ3bsFm+0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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