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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fa5afdd0db827dc0bdde39afc4b1054ca813c99e11a97db066599659ac3f8f' 
  AND token = '987JWw/eqSKM+Dl/h5/lBncsVrvb0aW4JS90H6hmxuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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