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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c86c00ecbd3a6b7281dc22e457beb843768faa24ac9eb15ea63ebf21947a2e' 
  AND token = '8PGleDUoqH5ko4VUkIIm4SXUPPJLDyqa2WDftlSoW2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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