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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab1fbc7c426f9e80f3078c01cf57a39c942efc9e6264652d13368c88b83ac99' 
  AND token = 'JgxvgKoq4Tt9lyTz8/tH/DBeikndIiiC378q+j1q9JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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