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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64654735e922deaf4fc750d28c32faaf8c457725bf76bd3f1fa52ea5e0aa7464' 
  AND token = '903nNHmg3ysGDqWogvFaL45RUqtAlEQbEN3mE/infew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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