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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3b7b9b880546e27bdd768dd45d3f7ee9b1720b4edf87657398fe0525bf384e' 
  AND token = 'l5hOembLg3zyZmD873wwns0AldkDmilY+eKcSGRe9o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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