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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc112af22fae778361dd352d29c4ec47b3658a089cd74465ab5f963c1a314be' 
  AND token = 'rY9XbMQGtA/ZkcYFpJ29BUl/SISemSpYpVQBkgGSd40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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