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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0369dc3d14807aad80f385e7f5c0b7fdf7de6da2c97306e9ed0e08811a78d7d' 
  AND token = 'jlWmYRx20bOh85KzuWwMznHtzYB4R59sSiwA0kLQxBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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