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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e5fcb1bb85c9594fcb3c917841b7a39c9ff87084c59efbfae7da38fc8318bf' 
  AND token = 'V+be2YMtL/7XYoTEkJoyU5YiB5Ut4KmK20OmJnal4kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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