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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bafc3f5cd64882e235bcbbd30b6af60da325d7f61a05ace3238e90a1a0a9767' 
  AND token = 'FdWIFbGDluC1HQbByD8NpTww3LN5ljti9PAK6aN+yV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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