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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f0fd12154948b7f7dc88255eac6d71b6c7f84aa91167456a1640854a4e99d3' 
  AND token = 'xzbg/tpGPWecupfOkkWh8SCLL33NcsTRZEc+K0Ks6cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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