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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e50828ffd0cb949c91b85da8a09f300dbee975c33b7c779ad9bbb07c9c86eaf' 
  AND token = '/OXFyxwPfs1Hxp7+b2BdZ1eB+odPs6nTMQEFlFVVsOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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