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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fedd0c092a009bcb531ca392d35c802ea4ef71216b09778246496b06c64c47' 
  AND token = 'G7UYMsmPwbyz98IwW0eOOPO+7Narpqh8egcyFiI16oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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