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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeade34ac3af7b07a8422e1090b23d931ede377f15dae9dc1b0ec0b7ab42fb16' 
  AND token = 'GI7KOcN4i0jJgb8+tebOt2uC8X6c0YJh1wPS5Zhg8Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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