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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594a23487c5bb2b1e7b78c0550babdd8fbaae07a7ba00d92a74128557310e38e' 
  AND token = 'klaL0w/SgrRBonDloTl099tcay4HdQrtDFyOeypGf64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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