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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e719f8b899729a5d57877dda4934f287bda548802393fd96149a91dcadaa1d7a' 
  AND token = '42+xt8KwJKnR3wheZbLbOS/TgcTy8N0mdja4jVZffpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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