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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebd801d4d92b620d3ac95c010b6f1ccc66bb33ac95775fa76c0dad262604e72' 
  AND token = 'ZDjwEoR0R1TuZZQ0V9WVd6Hu0Xx0lfeCutlwK9zgbR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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