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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a04e3f9ba4f924937555f2ea9679ec126f661d4c53de327a0887047e1b689a1' 
  AND token = 'lTOTmkiuaRhoLTCv7IfgW0l5v5TESKc/sUKXdIj6UAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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