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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062ec02828bcb33e320bc9361e3b136cdbb44ca7d41d2a54ba79f7713a4360b2' 
  AND token = 'O7L+ydDobdTb94WUB0zFJPuCcc2sCU58WOl1zEYlsVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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