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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f479ad5df4e4bca66d802b86b4d5759d5f9c86135c5f445cdd9b9343f9d32c3d' 
  AND token = 'DQolDJ+5zan/tR1P4+BcFKBbErrEWI0jqOQahka3bNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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