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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f74a8406c48e0a23d9df7ab390100585e103834e87854052cc488be11f77025' 
  AND token = 'QFxhTVF/RuiYEI1LTj9v968VhiXb2CTeh1z2SHyAObs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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